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GeezerVison is showing github.com — cloudstack/python/bindir/cloud-external-ipallocator.py at master · Skotha/cloudstack

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cloud-external-ipallocator.py

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#! /usr/bin/python
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
import web
import socket, struct
import cloud_utils
from cloud_utils import Command
urls = ("/ipallocator", "ipallocator")
app = web.application(urls, globals())
augtool = Command("augtool")
service = Command("service")
class dhcp:
_instance = None
def __init__(self):
self.availIP=[]
self.router=None
self.netmask=None
self.initialized=False
options = augtool.match("/files/etc/dnsmasq.conf/dhcp-option").stdout.strip()
for option in options.splitlines():
if option.find("option:router") != -1:
self.router = option.split("=")[1].strip().split(",")[1]
print self.router
dhcp_range = augtool.get("/files/etc/dnsmasq.conf/dhcp-range").stdout.strip()
dhcp_start = dhcp_range.split("=")[1].strip().split(",")[0]
dhcp_end = dhcp_range.split("=")[1].strip().split(",")[1]
self.netmask = dhcp_range.split("=")[1].strip().split(",")[2]
print dhcp_start, dhcp_end, self.netmask
start_ip_num = self.ipToNum(dhcp_start);
end_ip_num = self.ipToNum(dhcp_end)
print start_ip_num, end_ip_num
for ip in range(start_ip_num, end_ip_num + 1):
self.availIP.append(ip)
print self.availIP[0], self.availIP[len(self.availIP) - 1]
#load the ip already allocated
self.reloadAllocatedIP()
def ipToNum(self, ip):
return struct.unpack("!I", socket.inet_aton(ip))[0]
def numToIp(self, num):
return socket.inet_ntoa(struct.pack('!I', num))
def getFreeIP(self):
if len(self.availIP) > 0:
ip = self.numToIp(self.availIP[0])
self.availIP.remove(self.availIP[0])
return ip
else:
return None
def getNetmask(self):
return self.netmask
def getRouter(self):
return self.router
def getInstance():
if not dhcp._instance:
dhcp._instance = dhcp()
return dhcp._instance
getInstance = staticmethod(getInstance)
def reloadAllocatedIP(self):
dhcp_hosts = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.strip().splitlines()
for host in dhcp_hosts:
if host.find("dhcp-host") != -1:
allocatedIP = self.ipToNum(host.split("=")[1].strip().split(",")[1])
if allocatedIP in self.availIP:
self.availIP.remove(allocatedIP)
def allocateIP(self, mac):
newIP = self.getFreeIP()
dhcp_host = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.strip()
cnt = len(dhcp_host.splitlines()) + 1
script = """set %s %s
save"""%("/files/etc/dnsmasq.conf/dhcp-host[" + str(cnt) + "]", str(mac) + "," + newIP)
augtool < script
#reset dnsmasq
service("dnsmasq", "restart", stdout=None, stderr=None)
return newIP
def releaseIP(self, ip):
dhcp_host = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.strip()
path = None
for host in dhcp_host.splitlines():
if host.find(ip) != -1:
path = host.split("=")[0].strip()
if path == None:
print "Can't find " + str(ip) + " in conf file"
return None
print path
script = """rm %s
save"""%(path)
augtool < script
self.availIP.remove(ip)
#reset dnsmasq
service("dnsmasq", "restart", stdout=None, stderr=None)
class ipallocator:
def GET(self):
try:
user_data = web.input()
command = user_data.command
print "Processing: " + command
dhcpInit = dhcp.getInstance()
if command == "getIpAddr":
mac = user_data.mac
zone_id = user_data.dc
pod_id = user_data.pod
print mac, zone_id, pod_id
freeIP = dhcpInit.allocateIP(mac)
if not freeIP:
return "0,0,0"
print "Find an available IP: " + freeIP
return freeIP + "," + dhcpInit.getNetmask() + "," + dhcpInit.getRouter()
elif command == "releaseIpAddr":
ip = user_data.ip
zone_id = user_data.dc
pod_id = user_data.pod
dhcpInit.releaseIP(ip)
except:
return None
if __name__ == "__main__":
app.run()
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